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.25s is not fast enough to catch the $1 bill. How much time does it take for it to fall beyond her grasp? The length of a bill is 16 cm?

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s = 1/2 g t^2
t = sqrt( 2 s / g)
The distance to fall is 0.16m, so the time to fall that distance is
t = sqrt( 0.32m/(9.81m/s^2))
= 0.18 s

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